12217939 has 2 divisors, whose sum is σ = 12217940. Its totient is φ = 12217938.

The previous prime is 12217913. The next prime is 12217943. The reversal of 12217939 is 93971221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12217939 - 2⁷ = 12217811 is a prime.

It is not a weakly prime, because it can be changed into another prime (12217949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6108969 + 6108970.

It is an arithmetic number, because the mean of its divisors is an integer number (6108970).

Almost surely, 2^12217939 is an apocalyptic number.

12217939 is a deficient number, since it is larger than the sum of its proper divisors (1).

12217939 is an equidigital number, since it uses as much as digits as its factorization.

12217939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 34.

The square root of 12217939 is about 3495.4168563992. The cubic root of 12217939 is about 230.3205297853.

The spelling of 12217939 in words is "twelve million, two hundred seventeen thousand, nine hundred thirty-nine".